Unbreak on -stable by commenting out a call to pthread_atfork().

-stable doesn't yet have pthread_atfork().

Reported by:	Kent Stewart <kstewart at owt.com>

audio/xmcd/files/patch-ah

@@ -0,0 +1,26 @@
+--- cdda_d/pthr.c.orig	Mon Apr  5 17:41:11 2004
++++ cdda_d/pthr.c	Sun Apr 11 01:15:11 2004
+@@ -35,6 +35,7 @@
+ 
+ #ifdef CDDA_PTHREADS
+ 
++#include <sys/param.h>
+ #include "cdda_d/pthr.h"
+ 
+ /*
+@@ -889,6 +890,7 @@
+ 	pthr_sem[DATA].v = 0;
+ 
+ #ifndef __VMS	/* VMS has no real fork, so this does not apply */
++#if __FreeBSD_version >= 502100
+ 	/* Register fork handler */
+ 	if ((ret = pthread_atfork(NULL, NULL, cdda_pthr_atfork)) != 0) {
+ 		(void) sprintf(errbuf,
+@@ -899,6 +901,7 @@
+ 		cd->i->state = CDSTAT_COMPLETED;
+ 		return FALSE;
+ 	}
++#endif
+ #endif
+ 
+ 	/* Ignore SIGPIPE */